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Night
The sun is lower, ionosphere is lower, best frequency to use is lower
A to B - Possible optimum working frequency is 3 MHz
A to C - Possible optimum working frequency is between 5
- 7 MHz
A to D - Possible optimum working frequency is between 9 -12 MHz
Factors Which Affect HF/SSB Communications
There are a number of different factors which will affect the success of your
communications via HF/SSB radio. These are outlined below:-
Frequency Selection
Frequency selection is perhaps the most important factor that will determine the
success of your HF/SSB communications.
Generally speaking the greater the distance over which you want to communicate,
the higher the frequency you should use.
Beacon Call, a Selcall (Selective Call) function built into the Barrett 950 transceiver,
makes finding the correct frequency to use easy. Beacon Call is based on the
network transceivers all having a selection of frequencies that will accommodate
most ionospheric conditions. When in standby the network transceivers scan these
frequencies waiting for a call (Selcall or Beacon Call) from another transceiver. The
transceiver wishing to check for the best frequency to operate on sends a Beacon
Call to the station he wishes to contact. If his call to the other station is successful
he will hear a revertive call from the station he is calling, indicating the channel he
selected was suitable for the ionospheric conditions prevailing. If he does not hear
this revertive call or it is very weak, he tries on another channel until a revertive call
of satisfactory signal strength is heard.
Summary of Contents for 2090
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